package com.zy.levelcache.aop;

import com.zy.levelcache.annotation.LvCache;
import com.zy.levelcache.decoration.LvCacheManager;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.util.Arrays;

/**
 * 自定义注解Aop
 */
@Slf4j
@Aspect
@Component
public class LvCacheAop {
    @Autowired
    private LvCacheManager lvCacheManager;

    /***
     * 使用Aop拦截我们的方法上是否使用缓存注解
     * @param lvCache lvCache
     * @param joinPoint joinPoint
     * @return 目标方法返回值
     * @throws Throwable 异常
     */
    @Around(value = "@annotation(lvCache)")
    public Object doAround(ProceedingJoinPoint joinPoint, LvCache lvCache) throws Throwable {
        Signature signature = joinPoint.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        // 获取目标方法
        Method targetMethod = methodSignature.getMethod();


        String key = null;
        if (StringUtils.isEmpty(lvCache.key())) {
            // 拼接缓存的key
            key = targetMethod.getName() + Arrays.toString(targetMethod.getParameterTypes()) + Arrays.toString(joinPoint.getArgs());
        } else {
            key = lvCache.key();
        }

        return lvCacheManager.getCache(key, targetMethod.getReturnType(), joinPoint);
    }
}